uxcell Plastic Students 30/60 45 Degree Triangle Rulers Protractor Drawing Set 2 Pcs A set of clear triangles protractor, clear noumber. Suitable for student, teacher, school, craft, factory and office etc. A good choice and design for student, teacher and designer etc. 30/60 45 degree plastic triangle rulers protractor,suit for muilti angles measure. Center cutout finger lifts, easy to operate.